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173rd Airborne with Rockers- TC Derby Cover, 7 ¼ inches in diameter 2nd Armored Division Hell On Wheels The Army Jump Wings -The 173rd Airborne with Rockers TC Derby Cover, 7 inches in diameter combines precision engraving with a premium finish for riders who want their motorcycle to reflect their style, service, or personal story. Product Details Billet Aluminum, Chrome Plated Derby Cover. This derby cover is 7 inches in diameter. Please check your existing derby cover to confirm that it is 7 inches also. This part is also made with a diameter of 7 inches. Our process is